362
FNCA52 TJSJ 170824
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
424 AM AST SAT JAN 17 2026
DISCUSSION
INCREASING DAYTIME RH VALUES ARE EXPECTED TO PREVAIL. WINDS WILL
REMAIN FROM THE EAST TO NORTHEAST TODAY AND RANGE BETWEEN 12 AND
20 MPH WITH HIGHER GUSTS AROUND 25 MPH AND SEA BREEZE VARIATIONS.
THE RISK IS LOW TODAY, BUT WE ENCOURAGE PEOPLE TO STAY INFORMED.
PRZ014-180830-
SOUTHEAST COASTAL PLAINS-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 30 30
TEMP (24H TREND) 88 (+28) 69 (-2) 86
RH % (24H TREND) 44 (-15) 91 (+4) 49
WIND 20FT/EARLY(MPH) E 21 G28 E 17 G20 E 18 G23
WIND 20FT/LATE(MPH) E 21 G28 E 17 G20 E 18 G23
MIXING HGT(FT-AGL/MSL)4890 5500
TRANSPORT WND (MPH) E 24 E 23
VENT RATE (KT-FT) 102690 110000
DISPERSION 5 5
DSI 6 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-180830-
SOUTHERN HILLS-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 83 (+23) 66 (-3) 83
RH % (24H TREND) 60 (-11) 94 (+3) 59
WIND 20FT/EARLY(MPH) E 17 G19 E 17 E 16
WIND 20FT/LATE(MPH) E 17 G19 E 17 E 16
MIXING HGT(FT-AGL/MSL)5370 5880
TRANSPORT WND (MPH) E 24 E 22
VENT RATE (KT-FT) 112770 111720
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-180830-
NORTH COASTAL PLAINS-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 20 30
TEMP (24H TREND) 86 (+26) 69 (-2) 86
RH % (24H TREND) 61 (-6) 97 (+2) 61
WIND 20FT/EARLY(MPH) E 20 G23 E 18 E 20
WIND 20FT/LATE(MPH) E 20 G23 E 18 E 20
MIXING HGT(FT-AGL/MSL)4890 5660
TRANSPORT WND (MPH) E 25 E 21
VENT RATE (KT-FT) 107580 101880
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-180830-
NORTHERN HILLS-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 20
TEMP (24H TREND) 84 (+24) 66 (-3) 85
RH % (24H TREND) 62 (-4) 97 (0) 58
WIND 20FT/EARLY(MPH) E 19 E 16 E 17
WIND 20FT/LATE(MPH) E 19 E 16 E 17
MIXING HGT(FT-AGL/MSL)5430 6640
TRANSPORT WND (MPH) E 22 E 18
VENT RATE (KT-FT) 103170 106240
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-180830-
WEST COAST-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 50 0 20
TEMP (24H TREND) 87 (+27) 67 (-2) 86
RH % (24H TREND) 61 (-7) 94 (-2) 60
WIND 20FT/EARLY(MPH) E 16 E 17 E 17
WIND 20FT/LATE(MPH) E 16 E 17 E 17
MIXING HGT(FT-AGL/MSL)4470 5290
TRANSPORT WND (MPH) E 14 E 15
VENT RATE (KT-FT) 53640 68770
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-180830-
EASTERN INTERIOR-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 84 (+24) 67 (-3) 84
RH % (24H TREND) 65 (-5) 97 (+3) 64
WIND 20FT/EARLY(MPH) E 18 E 18 E 17
WIND 20FT/LATE(MPH) E 18 E 18 E 17
MIXING HGT(FT-AGL/MSL)4870 5000
TRANSPORT WND (MPH) E 25 E 22
VENT RATE (KT-FT) 107140 95000
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-180830-
LUQUILLO MOUNTAIN RANGE-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 79 (+19) 66 (-3) 79
RH % (24H TREND) 71 (-7) 99 (+2) 70
WIND 20FT/EARLY(MPH) E 16 G18 E 14 E 14 G17
WIND 20FT/LATE(MPH) E 16 G18 E 14 E 14 G17
MIXING HGT(FT-AGL/MSL)4300 4090
TRANSPORT WND (MPH) E 26 E 23
VENT RATE (KT-FT) 98900 81800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-180830-
CENTRAL MOUNTAIN RANGE-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 40 0 20
TEMP (24H TREND) 83 (+23) 63 (-4) 83
RH % (24H TREND) 63 (-8) 98 (0) 59
WIND 20FT/EARLY(MPH) E 12 E 13 E 11
WIND 20FT/LATE(MPH) E 12 E 13 E 11
MIXING HGT(FT-AGL/MSL)5980 6950
TRANSPORT WND (MPH) E 20 E 16
VENT RATE (KT-FT) 101660 97300
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-180830-
CAYEY MOUNTAIN RANGE-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 79 (+19) 66 (-2) 79
RH % (24H TREND) 71 (-6) 98 (+3) 72
WIND 20FT/EARLY(MPH) E 16 E 14 E 14
WIND 20FT/LATE(MPH) E 16 E 14 E 14
MIXING HGT(FT-AGL/MSL)4380 4370
TRANSPORT WND (MPH) E 28 E 24
VENT RATE (KT-FT) 105120 91770
DISPERSION 5 5
DSI 5 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-180830-
VIEQUES-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 40
TEMP (24H TREND) 86 (+26) 71 (-2) 85
RH % (24H TREND) 60 (-4) 94 (+1) 61
WIND 20FT/EARLY(MPH) E 20 G24 E 20 G25 E 18 G23
WIND 20FT/LATE(MPH) E 20 G24 E 20 G25 E 18 G23
MIXING HGT(FT-AGL/MSL)3570 3810
TRANSPORT WND (MPH) E 28 E 26
VENT RATE (KT-FT) 85680 87630
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-180830-
CULEBRA-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 40
TEMP (24H TREND) 85 (+25) 73 (-2) 85
RH % (24H TREND) 62 (-4) 94 (+5) 63
WIND 20FT/EARLY(MPH) E 20 G24 E 21 G26 E 19 G23
WIND 20FT/LATE(MPH) E 20 G24 E 21 G26 E 19 G23
MIXING HGT(FT-AGL/MSL)3370 3580
TRANSPORT WND (MPH) E 30 E 25
VENT RATE (KT-FT) 87620 78760
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-180830-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 10
TEMP (24H TREND) 87 (+27) 68 (-3) 86
RH % (24H TREND) 46 (-13) 91 (+1) 52
WIND 20FT/EARLY(MPH) E 24 G29 E 20 G25 E 24 G29
WIND 20FT/LATE(MPH) E 24 G29 E 20 G25 E 24 G29
MIXING HGT(FT-AGL/MSL)5350 5450
TRANSPORT WND (MPH) E 20 E 23
VENT RATE (KT-FT) 90950 109000
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-180830-
SAINT THOMAS AND SAINT JOHN-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 30
TEMP (24H TREND) 84 (+23) 73 (-2) 84
RH % (24H TREND) 67 (0) 96 (+6) 68
WIND 20FT/EARLY(MPH) E 19 G24 E 21 G27 E 19 G23
WIND 20FT/LATE(MPH) E 19 G24 E 21 G27 E 19 G23
MIXING HGT(FT-AGL/MSL)3570 3750
TRANSPORT WND (MPH) E 29 E 25
VENT RATE (KT-FT) 89250 82500
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-180830-
ST CROIX-
424 AM AST SAT JAN 17 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 30
TEMP (24H TREND) 85 (+25) 72 (-2) 85
RH % (24H TREND) 64 (-2) 91 (0) 66
WIND 20FT/EARLY(MPH) E 20 G24 E 20 G25 E 19 G23
WIND 20FT/LATE(MPH) E 20 G24 E 20 G25 E 19 G23
MIXING HGT(FT-AGL/MSL)4020 4320
TRANSPORT WND (MPH) E 30 E 28
VENT RATE (KT-FT) 104520 103680
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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